But now times the reason of bad review. The evaporator unit is bolted to the tank. It is fixed by a sealing ring on the ground and by the plugged tip. Sits the cartomizer now firmly on the battery carrier then you do not get it unscrewed because the evaporator unit rotates in the tank. And then emptied before the entire residual liquid when you pull the tank body.
Pity! If you want to live with that you have a solid cartomizer for little money.